Alex Ariff

What makes a first-tier jazz legacy? A signature instrumental style, recognizable within a phrase or two. A body of exceptional recordings, in the studio and in concert. A legion of imitators, great and small. A sense of broad cultural relevance. Maybe even a hit song or two.

"It used to be: 'Nashville — that's where you come to play country music.'"

The first "destination" jazz festival took place in Newport, R.I., in 1954 — multiple days, one stage and gorgeous scenery. These days, Newport is going strong, as is Monterey in California, and the festival model has expanded to multiple stages and far beyond big-brimmed hats and lawn chairs.

Why do hip-hop producers gravitate toward jazz samples? For a mood, for sonic timbre, for a unique rhythmic component. Swing is a precursor to the boom-bap. "If you're a hip-hop producer that wants a lot of melodic stuff happening," pianist Robert Glasper says, "you're probably going to go to jazz first."